CaCO3 crystals were obtained by freezing of bicarbonated water. Residual water was supersaturated. CO2 degassing going along with precipitation makes it an irreversible process. Hence the extreme hardness ... [more ▼]

CaCO3 crystals were obtained by freezing of bicarbonated water. Residual water was supersaturated. CO2 degassing going along with precipitation makes it an irreversible process. Hence the extreme hardness of some natural waters during frost. [less ▲]

Study of a cavity of Ascidian's bodies at the zoology station of Napoly in 1881 by comparing the following species : Phallusia mentula, Ph. mamillata, Ciona intestinalis, Perophora Listeri et Clavellina ... [more ▼]

Study of a cavity of Ascidian's bodies at the zoology station of Napoly in 1881 by comparing the following species : Phallusia mentula, Ph. mamillata, Ciona intestinalis, Perophora Listeri et Clavellina Rissoana. [less ▲]